include/linux/sysv_fs.h

   1 #ifndef _LINUX_SYSV_FS_H
   2 #define _LINUX_SYSV_FS_H
   3
   4 #if defined(__GNUC__)
   5 # define __packed2__    __attribute__((packed, aligned(2)))
   6 #else
   7 >> I want to scream! <<
   8 #endif
   9
  10
  11 #ifndef __KERNEL__
  12 typedef u16 __fs16;
  13 typedef u32 __fs16;
  14 #endif
  15
  16 /* inode numbers are 16 bit */
  17 typedef __fs16 sysv_ino_t;
  18
  19 /* Block numbers are 24 bit, sometimes stored in 32 bit.
  20    On Coherent FS, they are always stored in PDP-11 manner: the least
  21    significant 16 bits come last. */
  22 typedef __fs32 sysv_zone_t;
  23
  24 /* 0 is non-existent */
  25 #define SYSV_BADBL_INO  1       /* inode of bad blocks file */
  26 #define SYSV_ROOT_INO   2       /* inode of root directory */
  27
  28
  29 /* Xenix super-block data on disk */
  30 #define XENIX_NICINOD   100     /* number of inode cache entries */
  31 #define XENIX_NICFREE   100     /* number of free block list chunk entries */
  32 struct xenix_super_block {
  33         __fs16          s_isize; /* index of first data zone */
  34         __fs32          s_fsize __packed2__; /* total number of zones of this fs */
  35         /* the start of the free block list: */
  36         __fs16          s_nfree;        /* number of free blocks in s_free, <= XENIX_NICFREE */
  37         sysv_zone_t     s_free[XENIX_NICFREE]; /* first free block list chunk */
  38         /* the cache of free inodes: */
  39         __fs16          s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */
  40         sysv_ino_t      s_inode[XENIX_NICINOD]; /* some free inodes */
  41         /* locks, not used by Linux: */
  42         char            s_flock;        /* lock during free block list manipulation */
  43         char            s_ilock;        /* lock during inode cache manipulation */
  44         char            s_fmod;         /* super-block modified flag */
  45         char            s_ronly;        /* flag whether fs is mounted read-only */
  46         __fs32          s_time __packed2__; /* time of last super block update */
  47         __fs32          s_tfree __packed2__; /* total number of free zones */
  48         __fs16          s_tinode;       /* total number of free inodes */
  49         __fs16          s_dinfo[4];     /* device information ?? */
  50         char            s_fname[6];     /* file system volume name */
  51         char            s_fpack[6];     /* file system pack name */
  52         char            s_clean;        /* set to 0x46 when filesystem is properly unmounted */
  53         char            s_fill[371];
  54         s32             s_magic;        /* version of file system */
  55         __fs32          s_type;         /* type of file system: 1 for 512 byte blocks
  56                                                                 2 for 1024 byte blocks
  57                                                                 3 for 2048 byte blocks */
  58
  59 };
  60
  61 /*
  62  * SystemV FS comes in two variants:
  63  * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2).
  64  * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4).
  65  */
  66 #define SYSV_NICINOD    100     /* number of inode cache entries */
  67 #define SYSV_NICFREE    50      /* number of free block list chunk entries */
  68
  69 /* SystemV4 super-block data on disk */
  70 struct sysv4_super_block {
  71         __fs16  s_isize;        /* index of first data zone */
  72         u16     s_pad0;
  73         __fs32  s_fsize;        /* total number of zones of this fs */
  74         /* the start of the free block list: */
  75         __fs16  s_nfree;        /* number of free blocks in s_free, <= SYSV_NICFREE */
  76         u16     s_pad1;
  77         sysv_zone_t     s_free[SYSV_NICFREE]; /* first free block list chunk */
  78         /* the cache of free inodes: */
  79         __fs16  s_ninode;       /* number of free inodes in s_inode, <= SYSV_NICINOD */
  80         u16     s_pad2;
  81         sysv_ino_t     s_inode[SYSV_NICINOD]; /* some free inodes */
  82         /* locks, not used by Linux: */
  83         char    s_flock;        /* lock during free block list manipulation */
  84         char    s_ilock;        /* lock during inode cache manipulation */
  85         char    s_fmod;         /* super-block modified flag */
  86         char    s_ronly;        /* flag whether fs is mounted read-only */
  87         __fs32  s_time;         /* time of last super block update */
  88         __fs16  s_dinfo[4];     /* device information ?? */
  89         __fs32  s_tfree;        /* total number of free zones */
  90         __fs16  s_tinode;       /* total number of free inodes */
  91         u16     s_pad3;
  92         char    s_fname[6];     /* file system volume name */
  93         char    s_fpack[6];     /* file system pack name */
  94         s32     s_fill[12];
  95         __fs32  s_state;        /* file system state: 0x7c269d38-s_time means clean */
  96         s32     s_magic;        /* version of file system */
  97         __fs32  s_type;         /* type of file system: 1 for 512 byte blocks
  98                                                                 2 for 1024 byte blocks */
  99 };
 100
 101 /* SystemV2 super-block data on disk */
 102 struct sysv2_super_block {
 103         __fs16  s_isize;                /* index of first data zone */
 104         __fs32  s_fsize __packed2__;    /* total number of zones of this fs */
 105         /* the start of the free block list: */
 106         __fs16  s_nfree;                /* number of free blocks in s_free, <= SYSV_NICFREE */
 107         sysv_zone_t s_free[SYSV_NICFREE];       /* first free block list chunk */
 108         /* the cache of free inodes: */
 109         __fs16  s_ninode;               /* number of free inodes in s_inode, <= SYSV_NICINOD */
 110         sysv_ino_t     s_inode[SYSV_NICINOD]; /* some free inodes */
 111         /* locks, not used by Linux: */
 112         char    s_flock;                /* lock during free block list manipulation */
 113         char    s_ilock;                /* lock during inode cache manipulation */
 114         char    s_fmod;                 /* super-block modified flag */
 115         char    s_ronly;                /* flag whether fs is mounted read-only */
 116         __fs32  s_time __packed2__;     /* time of last super block update */
 117         __fs16  s_dinfo[4];             /* device information ?? */
 118         __fs32  s_tfree __packed2__;    /* total number of free zones */
 119         __fs16  s_tinode;               /* total number of free inodes */
 120         char    s_fname[6];             /* file system volume name */
 121         char    s_fpack[6];             /* file system pack name */
 122         s32     s_fill[14];
 123         __fs32  s_state;                /* file system state: 0xcb096f43 means clean */
 124         s32     s_magic;                /* version of file system */
 125         __fs32  s_type;                 /* type of file system: 1 for 512 byte blocks
 126                                                                 2 for 1024 byte blocks */
 127 };
 128
 129 /* V7 super-block data on disk */
 130 #define V7_NICINOD     100     /* number of inode cache entries */
 131 #define V7_NICFREE     50      /* number of free block list chunk entries */
 132 struct v7_super_block {
 133         __fs16 s_isize;        /* index of first data zone */
 134         __fs32 s_fsize __packed2__; /* total number of zones of this fs */
 135         /* the start of the free block list: */
 136         __fs16 s_nfree;        /* number of free blocks in s_free, <= V7_NICFREE */
 137         sysv_zone_t s_free[V7_NICFREE]; /* first free block list chunk */
 138         /* the cache of free inodes: */
 139         __fs16 s_ninode;       /* number of free inodes in s_inode, <= V7_NICINOD */
 140         sysv_ino_t      s_inode[V7_NICINOD]; /* some free inodes */
 141         /* locks, not used by Linux or V7: */
 142         char    s_flock;        /* lock during free block list manipulation */
 143         char    s_ilock;        /* lock during inode cache manipulation */
 144         char    s_fmod;         /* super-block modified flag */
 145         char    s_ronly;        /* flag whether fs is mounted read-only */
 146         __fs32  s_time __packed2__; /* time of last super block update */
 147         /* the following fields are not maintained by V7: */
 148         __fs32  s_tfree __packed2__; /* total number of free zones */
 149         __fs16  s_tinode;       /* total number of free inodes */
 150         __fs16  s_m;            /* interleave factor */
 151         __fs16  s_n;            /* interleave factor */
 152         char    s_fname[6];     /* file system name */
 153         char    s_fpack[6];     /* file system pack name */
 154 };
 155
 156 /* Coherent super-block data on disk */
 157 #define COH_NICINOD     100     /* number of inode cache entries */
 158 #define COH_NICFREE     64      /* number of free block list chunk entries */
 159 struct coh_super_block {
 160         __fs16          s_isize;        /* index of first data zone */
 161         __fs32          s_fsize __packed2__; /* total number of zones of this fs */
 162         /* the start of the free block list: */
 163         __fs16 s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */
 164         sysv_zone_t     s_free[COH_NICFREE] __packed2__; /* first free block list chunk */
 165         /* the cache of free inodes: */
 166         __fs16          s_ninode;       /* number of free inodes in s_inode, <= COH_NICINOD */
 167         sysv_ino_t      s_inode[COH_NICINOD]; /* some free inodes */
 168         /* locks, not used by Linux: */
 169         char            s_flock;        /* lock during free block list manipulation */
 170         char            s_ilock;        /* lock during inode cache manipulation */
 171         char            s_fmod;         /* super-block modified flag */
 172         char            s_ronly;        /* flag whether fs is mounted read-only */
 173         __fs32          s_time __packed2__; /* time of last super block update */
 174         __fs32          s_tfree __packed2__; /* total number of free zones */
 175         __fs16          s_tinode;       /* total number of free inodes */
 176         __fs16          s_interleave_m; /* interleave factor */
 177         __fs16          s_interleave_n;
 178         char            s_fname[6];     /* file system volume name */
 179         char            s_fpack[6];     /* file system pack name */
 180         __fs32          s_unique;       /* zero, not used */
 181 };
 182
 183 /* SystemV/Coherent inode data on disk */
 184 struct sysv_inode {
 185         __fs16 i_mode;
 186         __fs16 i_nlink;
 187         __fs16 i_uid;
 188         __fs16 i_gid;
 189         __fs32 i_size;
 190         u8  i_data[3*(10+1+1+1)];
 191         u8  i_gen;
 192         __fs32 i_atime; /* time of last access */
 193         __fs32 i_mtime; /* time of last modification */
 194         __fs32 i_ctime; /* time of creation */
 195 };
 196
 197 /* SystemV/Coherent directory entry on disk */
 198 #define SYSV_NAMELEN    14      /* max size of name in struct sysv_dir_entry */
 199 struct sysv_dir_entry {
 200         sysv_ino_t inode;
 201         char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */
 202 };
 203
 204 #define SYSV_DIRSIZE    sizeof(struct sysv_dir_entry)   /* size of every directory entry */
 205
 206 #endif /* _LINUX_SYSV_FS_H */